I saw a couple of comments from other posters on your questions and want to interject my two cents. First, the LT is NOT underpowered by any stretch of the imagination, and second, I have yet to see a stock Harley (or a relatively modded Harley) that accelerates and handles like the LT. My friend's '03 Ultra Classic has a 103 cu in kit and screamin' eagle carburetion/exhaust mods. He readily admits (after we swapped bikes for an extended ride) the LT would humiliate his Ultra anytime, anywhere.
I think you would tremendously enjoy the performance and handling of the LT. For me, low speed handling has never been an issue and I have only dropped my LT once in the five years I have owned the bike (due to planting my foot on rounded gravel and having my foot go out from underneath me - not from any top-heaviness of the bike). An added benefit is the gas mileage. I ride at the 3000 - 5000 ft elevation level and consistently get 60mpg at 70 mph....no Goldwing or Harley will do that. The anti-lock brakes have saved my bacon on more than one occassion. Passenger comfort is superior and my SO also nods off because she is so comfortable (yes, passenger armrests are available). My LT is a 2000 model rated at 100hp and 84 ft lbs of torque. Because I typically pull a trailer (at between 400-500 lbs loaded) I installed a Rhinewest performance chip at CCR 2005 and have been very pleased with the results. The chip adds 7-8 hp and 9-10 ft lbs of torque; for me it was a worthwhile expenditure ($400).
I can't comment on the "next generation" of LT's because to the best of my knowledge no facts, only rumors, exist.
I had the opportunity to ride the K1200GT, the R1200RT, and the K1200S at Sturgis last week. The GT has great power (152 hp) and the RT has very good power (110hp). The riding positions and wind protection were not to my liking. The RT also buzzed my throttle hand to the point of two-finger numbness after a 45 mile run. Both the RT and the GT had suspensions too mushy for my taste (maybe their suspensions are adjustable?). In short, I would not trade my LT for either of these current models. If the "next gen" LT is a warmed-over version of the current GT, I will keep my 2000LT.
The K1200S, while not a distance tourer, was an absolute blast to ride. At 167 hp, the only bike I have ridden that compares to it is the Kawi ZX-14, but only in the power department. The K1200S suspension and handling was noticeably better than the ZX's. While at a gas station in Sundance, WY I saw a K1200S with a Florida license plate. The rider confirmed he did, indeed, ride to Sturgis from Florida and averaged better than 50 mpg. If I had an extra $15K I would own a K1200S in a heartbeat (as an addition, not a replacement, to my LT).
That's my $.02. Get yourself an LT, you won't regret the decision.